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...o several notable [[List of conjectures|conjectures]] or [[open problem]]s in various academic fields: * [[List of unsolved problems in astronomy|Unsolved problems in astronomy]] ...

...the [[Giant Dipole Resonance|giant dipole resonance]] also occurs roughly in this energy range (at 10 EeV/nucleon) and similarly restricts very long-dis ...ys are produced near our galaxy or that [[Lorentz covariance]] is violated in such a way that protons do not lose energy on their way to our galaxy. ...

...ast1=Wheeler |first2=R. P. |last2=Feynman |title=Classical Electrodynamics in Terms of Direct Interparticle Action |journal=[[Reviews of Modern Physics]] ...|first2=Richard Phillips |date=1949-07-01 |title=Classical Electrodynamics in Terms of Direct Interparticle Action |url=https://link.aps.org/doi/10.1103/ ...

...estions in Cosmic-Ray Research at Ultrahigh Energies |journal=Frontiers in Astronomy and Space Sciences |year=2019 |volume=6 |pages=23 |doi=10.3389/fspas.2019.0 ...bove {{val|5.7|e=19|u=eV}}, that is, about one such event every four weeks in the 3000&nbsp;km² area surveyed by the observatory.<ref> ...

...of [[galaxies]]. It is an alternative to the hypothesis of [[dark matter]] in terms of explaining why galaxies do not appear to obey the currently unders ...the [[Solar System]] or on Earth.{{Dubious|reason=MOND could be observable in the outer solar system as orbits of KBOs should be influenced by the Galact ...

...energy is known to be smooth because it doesn't accumulate preferentially in galaxies and clusters..."</ref> Dark energy's [[Energy density|density]] is ...entists thought that the gravitational attraction of [[matter]] and energy in the universe would cause the universe's expansion to slow over time. Since ...

...on [[crystal lattice]]s of atoms, the [[Bose–Einstein condensates]] found in [[ultracold atom]]ic systems, and [[liquid crystals]]. Condensed matter phy ...7|website=Physics Today Jobs|title= Condensed Matter Physics Jobs: Careers in Condensed Matter Physics|access-date= 2010-11-01}}</ref> and the Division o ...

...ransform into ordered 3D meshes of crystalline [[nanowire]]s as summarized in the model below.<ref>{{Cite journal | doi= 10.1039/C4TA02202E| title= Templ ...ry]] discusses self-organization in terms of islands of [[predictability]] in a sea of chaotic unpredictability. ...

...gs, primarily [[Human intelligence|of humans]]. It is a [[field of study]] in [[computer science]] that develops and studies intelligent machines. Such m ...tools (e.g., [[ChatGPT]] and [[AI art]]), and superhuman play and analysis in [[strategy game]]s (e.g., [[chess]] and [[Go (game)|Go]]).{{sfnp|Google|201 ...

...elds lead to a kind of reintroduction of an [[Luminiferous aether|aether]] in physics{{sfnp|Sciama|1991|p=137}}{{sfnp|Davies|2011}} since some systems ca ...of the greatest [[List of unsolved problems in physics|unsolved mysteries in physics]]. Many physicists believe that "the vacuum holds the key to a full ...